States → Oregon
State profile · EPA SDWIS + UCMR5
Oregon Drinking Water Quality
2,518 public water systems serve 4,005,242 people across Oregon, with every Safe Drinking Water Act violation and UCMR5 PFAS result on record.
- 2,518
- Water systems
- 206,659
- Total violations
- 98.5%
- Systems w/ a violation
- 24%
- PFAS detection rate
The verdict
Across Oregon, 2,481 of 2,518 water systems (98.5%) carry at least one EPA violation, and 30 of 125 UCMR5-tested systems show PFAS.
- 206,659
- Total EPA violations on record
- 10%
- Health-based (MCL / treatment)
- 98.5%
- Systems with ≥1 violation
- 24%
- UCMR5 PFAS detection rate
Water Systems
2,518
Total Violations
206,659
Violation Rate
98.5%
PFAS Detection
24%
30 of 125 tested
Violation Composition
How Oregon's 206,659 violations break down by type, per EPA SDWIS classification.
Health-based (20,339) Monitoring/Reporting (186,320)
| Metric | Value | Share |
|---|---|---|
| Public water systems | 2,518 | - |
| Population served | 4,005,242 | - |
| Total violations | 206,659 | 100% |
| Health-based violations | 20,339 | 9.8% |
| Systems with violations | 2,481 | 98.5% |
| PFAS detection rate | 30 of 125 | 24% |
Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement. Monitoring/reporting violations indicate procedural issues (missed tests, late reports) - not necessarily a contamination event.
Largest Water Systems
Portland Water Bureau
Portland, OR · 666,200 served
Tualatin Valley Water District
Beaverton, OR · 224,600 served
Salem Public Works
Salem, OR · 199,820 served
Eugene Water & Electric Board
Eugene, OR · 176,000 served
Medford Water Commission
Medford, OR · 106,068 served
Hillsboro, City Of
Hillsboro, OR · 92,632 served
Beaverton, City Of
Beaverton, OR · 88,045 served
Bend, City Of
Bend, OR · 77,704 served
Gresham, City Of
Gresham, OR · 73,932 served
Rockwood PUD
Portland, OR · 65,443 served
Tigard, City Of
Tigard, OR · 62,500 served
Springfield Utility Board
Springfield, OR · 62,100 served
Corvallis, City Of
Corvallis, OR · 61,468 served
Albany, City Of
Albany, OR · 57,997 served
Sunrise Water Authority
Happy Valley, OR · 50,003 served
Klamath Falls Water Dept
Klamath Falls, OR · 40,475 served
Lake Oswego Municipal Water
Lake Oswego, OR · 40,000 served
Keizer, City Of
Keizer, OR · 38,585 served
Redmond Water Department
Redmond, OR · 37,566 served
Grants Pass, City Of
Grants Pass, OR · 37,138 served
Most Violations
#1 Santiam Meadows Community WS Salem
1,988 #2 Hiland WC - Bear Creek Newberg
1,799 #3 Galice Subdivision Water Co Merlin
1,619 #4 Hiland WC - Boulder Creek Newberg
1,380 #5 Trollers Cove Water Assn Tidewater
1,224 #6 Sportsmans Paradise Motel/Tc Keno
1,023 #7 Lawson Acres Water Association Riddle
960 #8 Golf MHP Seattle
954 #9 Saginaw Park Water System Eugene
934 #10 Weiss Estates Water System Bandon
888 #11 London Water Co-Op Cottage Grove
862 #12 Marshland Water Association Clatskanie
829 #13 Pisgah Public Market Eugene
796 #14 Brewster Community Homeowners Salem
764 #15 Deer Island Heights WS St Helens
763 Counties in Oregon
Multnomah
57 systems · 854,646 served
· 4,422 violations
Washington
96 systems · 597,244 served
· 7,314 violations
Clackamas
231 systems · 385,530 served
· 18,114 violations
Marion
196 systems · 370,079 served
· 19,281 violations
Lane
237 systems · 327,688 served
· 16,216 violations
Deschutes
138 systems · 204,759 served
· 5,986 violations
Jackson
208 systems · 197,238 served
· 12,362 violations
Linn
167 systems · 125,361 served
· 9,206 violations
Douglas
102 systems · 93,351 served
· 10,608 violations
Yamhill
91 systems · 90,673 served
· 5,862 violations
Benton
48 systems · 72,210 served
· 3,039 violations
Umatilla
76 systems · 71,259 served
· 7,500 violations
Lincoln
52 systems · 61,506 served
· 9,051 violations
Josephine
152 systems · 60,301 served
· 11,657 violations
Klamath
108 systems · 58,638 served
· 8,722 violations
Polk
29 systems · 53,707 served
· 2,619 violations
Coos
47 systems · 51,546 served
· 6,822 violations
Clatsop
31 systems · 41,699 served
· 5,305 violations
Columbia
56 systems · 40,231 served
· 9,494 violations
Tillamook
63 systems · 33,756 served
· 4,704 violations
Hood River
21 systems · 27,740 served
· 1,275 violations
Jefferson
31 systems · 26,851 served
· 1,468 violations
Wasco
44 systems · 25,689 served
· 4,505 violations
Malheur
25 systems · 22,466 served
· 4,518 violations
Union
23 systems · 21,181 served
· 1,293 violations
Curry
37 systems · 18,844 served
· 3,619 violations
Crook
38 systems · 16,670 served
· 1,924 violations
Baker
23 systems · 14,604 served
· 2,306 violations
Morrow
15 systems · 13,645 served
· 2,014 violations
Wallowa
10 systems · 5,391 served
· 1,150 violations
Showing top 30 of 36 counties.
Drinking Water Guides
Frequently Asked Questions
How many water systems are in Oregon? ▼
Oregon has 2,518 public water systems serving approximately 4,005,242 people. These include community water systems, non-transient non-community systems, and transient non-community systems regulated under the Safe Drinking Water Act.
How many drinking water violations are in Oregon? ▼
Oregon has 206,659 total drinking water violations on record, with 20,339 classified as health-based violations. 98.5% of water systems in the state have at least one violation.
Has PFAS been found in Oregon drinking water? ▼
Of 125 water systems tested for PFAS in Oregon, 30 had PFAS detected, a 24% detection rate. PFAS are persistent "forever chemicals" that do not break down in the environment.
What is the violation rate for Oregon water systems? ▼
Oregon's violation rate is 98.5%. This measures the percentage of public water systems that have at least one recorded violation in the EPA SDWIS database, including both health-based and monitoring/reporting violations.
Where does this Oregon water data come from? ▼
All drinking water data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS is the federal database that tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources & Methodology
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.